Fax Operation; Fax Basics - ZyXEL Communications U-336S User Manual

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Fax Operation

The U-336S/SA can be used as a fax machine. In the sections below,
we will describe how the modem works as a fax machine, the ITU-T
T.30 fax protocol, the Class 1,2, and 2.0 fax commands and ZyXEL
extended fax AT commands. Also covered are the status report result
codes, the flow control protocol associated with ZyXEL fax AT
commands, and some specific fax applications. The instructions for
using the included modem/fax/voice utility program are included on the
software disk. Some distributors and dealers may have included other
software with your modem. For help with such software, refer to the
software instructions.

Fax Basics

Fax is the abbreviation for facsimile. There are four major parts in a fax
machine: the scanner, encoding and decoding device, modem, and
printer. Before a page can be sent, it is first scanned. The bit-mapped
data is encoded with data compression and is then transmitted across
the phone line by an internal modem module. The remote facsimile
receives the data with its internal modem, decodes it back to bit-
mapped image data, and prints it on paper.
Fax Branding: The Telephone Consumer Protection Act of 1991
makes it unlawful for any person to use a computer or other electronic
device to send any message via a telephone or fax machine unless such
message clearly contains in a margin at the top or bottom of each
transmitted page or on the first page of the transmission, the date and
time it is sent and an identification of the business or other entity, or
individual sending the message and the telephone number of the sending
64 Fax Operation